MIMO-WDM Visible Light Communications Based on Commercial RGBA LEDs

Vs, Rakesh Krishna; Djordjević, Ivan B.

doi:10.1109/icton.2018.8473901

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…For instance, Wei et al reported a 6.9 Gbit/s VLC system with functional transmission distance based on white-light phosphor laser [187]. In addition, as reported in some of the previously highlighted works, techniques to linearize and compensate the LED response over the frequency can be used, applying pre-distorter or equalizer, and also MIMO techniques, to enhance the total throughput [172], [173], [175], [183].…”

Section: Vlc-visible Light Communicationsmentioning

confidence: 96%

“…They also established the improvement of the signal-to-interference-plus-noise ratio (SINR) in systems with multiple MIMO users, when the receivers are placed at different beam arrival angles. In [173], the authors experimentally demonstrated the joint implementation of WDM and MIMO techniques to transmit modulated data streams in discrete multitone (DTM). Mejia and Georghiades [174] presented an overview of color-shiftkeying (CSK), based on red, green and blue (RGB) LEDs, by considering different coding methods, with emphasis on CSK trellis-coded modulation (TCM) and CSK finite-state-machines (FSM) codings, which provided higher SNR.…”

Section: Vlc-visible Light Communicationsmentioning

confidence: 99%

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Wireless and Optical Convergent Access Technologies Toward 6G

Filgueiras¹,

Lima

Cunha

et al. 2023

IEEE Access

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The sixth generation of mobile communication (6G) systems is recently rising a lot of interest, introducing new futuristic and challenging use cases that will demand much more than just communications to become a reality. Higher throughput, lower latencies, higher number of connections will push the requirement of the future mobile networks to a new level, but also sensing, positioning and imaging will play an important role in the new foreseen use cases. The integration of techniques developed for wireless communications with those conceived for optical links will be essential to provide the infrastructure for the 6G networks. In this context, this paper presents a review on wireless and optical convergent access solutions towards the 6G systems. The manuscript brings the use cases, requirements and enablers for 6G networks including a discussion about the state-of-the-art on THz and sub-THz communications, wireless and optical convergence, visible light communication, integrated and free-space optics, new antenna designs, powerover-fiber deployments and the use of machine learning in the physical layer of future networks. By reviewing the most relevant contributions available in the literature for wireless and optical communications and presenting their main contributions, this paper clearly shows that, more than a technological trend, the convergence of wireless and optical technologies is a fundamental step towards the development of the 6G network infrastructure.

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Section: Vlc-visible Light Communicationsmentioning

confidence: 96%

Section: Vlc-visible Light Communicationsmentioning

confidence: 99%

Wireless and Optical Convergent Access Technologies Toward 6G

Filgueiras¹,

Lima

Cunha

et al. 2023

IEEE Access

View full text Add to dashboard Cite

show abstract

“…Data rates > 1 Gb/s over a transmission distance of 1 m using four channels, and 7.48 Gb/s over 0.5 m using nine channels via individually addressable micro LED (µLED) arrays, as reported in [5]. In [13][14][15][16], the combination of WDM and MIMO were employed to improve both the aggregated data rate (6.36 Gb/s) and reliability of the VLC. In [13], a hybrid WDM-MIMO successive interference cancelation algorithm was used to further reduce the interference between channels.…”

Section: Introductionmentioning

confidence: 99%

Optical Filter-Less WDM for Visible Light Communications Using Defocused MIMO

et al. 2021

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This paper experimentally investigates, for the first time, a new wavelength-division multiplexing-based visible light communications link based on a defocused non-imaging multiple-input multiple-output (MIMO), which removes the need for tuned optical bandpass filters paired with each receiver. The proposed system is based on using the natural diversity of the individual light emitting diodes (LEDs) within a single light source to generate an H-matrix, which is independent of spatial diversity. We show that, by transmitting K-independent sets of non-return to zero on-and-off keying signals on separate wavelengths, the received superposed symbols can be demultiplexed. The non-imaging MIMO diversity is achieved by considering the power-current characteristics of the light emitting diode, the responsivity of the photodetector array, and the defocused beam spot. The system is empirically verified for K = 3 using red, green, and blue LEDs with Q-factors of 7.66, 7.69, and 4.75 dB, respectively.

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Mobility aware of WDM-based CMO OFDM communication system

Hardan

Abdulkafi

Thalij

et al. 2021

Journal of Optical Communications

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The continued increase in several mobile applications forces to replace existing limited spectrum indoor radio frequency wireless connections with high-speed ones. Visible light communications (VLC) technology has gained prominence in the development of high data rate transmission for fifth-generation networks. In optical wireless communications, light-emitting diode (LED) transmitters are used in applications that desire mobility as LED divergence enables larger coverage. Since each VLC access point covers a small area, handovers of mobile users are inevitable. Wavelength division multiplexing (WDM) can be used in VLC systems to tackle the above issue and to meet the increasing demand for indoor connectivity with high bit rates. In this paper, a new system architecture for WDM with coded modulated optical in orthogonal frequency division multiplexing (OFDM) VLC system in conjunction with red, green, blue, and yellow (RGBY) LEDs is proposed to reduce the impact of random receiver orientation of indoor mobile users over VLC downlink channels and improves the system’s bit-error-rate (BER) performance. Simulation results show that the proposed method is not affected by the user’s mobility and hence it performs better than other approaches, in terms of BER for all scenarios and at all positions. This study reveals that using WDM-OFDM-VLC with RGBY LEDs to construct a VLC system is very promising.

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MIMO-WDM Visible Light Communications Based on Commercial RGBA LEDs

Cited by 3 publications

References 9 publications

Wireless and Optical Convergent Access Technologies Toward 6G

Wireless and Optical Convergent Access Technologies Toward 6G

Optical Filter-Less WDM for Visible Light Communications Using Defocused MIMO

Mobility aware of WDM-based CMO OFDM communication system

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